How to prepare a iodine standar solutions in the range of micrograms per liter accurately?

Suggest create an amount of stock iodine standard by measuring out 1 L diluent, removing 1000 micrograms and replacing with 1000 micrograms iodine. Use a pipette. 1000 micro-gram / L stock.

Then prepare dilutions: Say you require 20 mL of each dilution. 10 mL stock + 10 mL diluent gives you 20 mL 500 micro-gram/L, 8 mL stock + 12 mL diluent gives you 20 mL 400 micro-gram/L, 6 mL stock + 14 mL diluent gives you 20 mL 300 micro-gram/L, 4 mL stock + 16 mL diluent gives you 20 mL 200 micro-gram/L, 2 mL stock + 18 mL diluent gives you 20 mL 100 micro-gram/L, 0.8 mL stock + 19.2 mL diluent gives you 20 mL 40 micro-gram/L, 0.4 mL stock + 19.6 mL diluent gives you 20 mL 20 micro-grams/L. If you need say 100 mL of each dilution, then multiply mL stock and diluent by 5.

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